人教版（2019）选择性必修 第三册Unit 3 Environmental Protection Reading and Thinking课件（34张）

(共34张PPT)
Reading and Thinking
Unit 3 Environmental Protection
By the end of this period, you will be able to:
learn more about climate change and draw a diagram describing how “greenhouse effect” works;
learn to identify the style of the text and infer the writer’s purpose;
voice their personal opinions about how to deal with climate change.
Earth provides enough to satisfy every man’ s needs, but not every man’ s greed.
— Mohandas K. Gandhi
Do you like polar bears
Pre-reading
But this is what polar bears are really like!
What caused the polar bear’s death Please look at the title and pictures to get some clues.
Global warming
What other consequences may global warming bring about
Let’s read the passage to explore more about it!
While-reading
Activity 1　Fast- reading for basic information
Ⅰ. What does the text mainly tell us
A．Some polar bears died of starvation.
B．What the greenhouse effect is.
C．Global warming has caused some disasters and we must pay attention to it.
D．How polar bears find food.
√
Ⅱ. Match the main idea with each paragraph.
Part 1(Paras.1－2)　 A．The effects of the rise in temperature.
Part 2(Para.3) 　　 B．The causes of global warming.
Part 3(Para.4) 　　 C．The solutions to reducing greenhouse gas emissions.
Part 4(Para.5) 　　 D．The evidence of dramatic climate change.
Activity 2　Careful- reading for details
Ⅰ.Read Paras.1－2 carefully and do the following exercises.
The _____ is getting warmer and warmer.
1. Fill in the blanks.
earth
Evidence l: ____________________________
Evidence 2: __________________
Evidence 3: _______________________
Problem
Climate change
a warming ocean and atmosphere
melting ice
rising sea levels
2. The following reasons account for the death of the polar bear，with one influencing another. Read paragraph 2 and put them in a correct logical order.
low sea-ice levels starvation longer food-seeking travel
lack of food climate change
climate change
low sea-ice levels
lack of food
longer food-seeking travel
starvation
What is the root cause
3．Which of the following is not a proof of a dramatic change in the global climate
A．A warming ocean and atmosphere.
B．Melting ice.
C．Rising sea levels.
D．A large population.
√
4．What does the case of the polar bear show
A．Food shortage becomes a major threat to creatures.
B．Human activities affect the survival of polar bears.
C．The increase in temperature has an effect on Earth’s ecology.
D．The hunting behaviour of mankind leads to the sharp decrease of animals.
5．Which of the following can replace the word “alarming” in paragraph 2
A．Scary. B．Worrying.
C．Awful. D．Troublesome.
√
√
Ⅱ.Read Para.3 carefully and do the following exercises.
1. What is causing the increase in the global average surface temperature
Greenhouse effect
___________ greenhouse effect
Definition(定义):
People produce huge amounts of _____ greenhouse gases by burning __________.
Function(作用):
More ____ energy is trapped in the atmosphere and causes Earth’s surface temperature to___ quickly.
_________ greenhouse effect
Definition(定义):
Heat from the sun enters the _________ and warms Earth’s ______ as ____-wave radiation.
Function(作用):
Keeping Earth’s climate warm and __________.
“Natural”
“Man-made”
atmosphere
surface
short
habitable
extra
fossil fuels
heat
rise
2. Can you draw a diagram describing how the greenhouse effect works.
Heat released back into space
Heat reflected back to Earth’s surface
Reflected sunlight
Atmosphere
Sunlight
Draw a diagram
Diagrams are very useful tools that can be used to brainstorm ideas, map out processes, show cause and effect relationships, explain a new idea or concept, and so on.
3．What does the third paragraph mainly tell us
A．What the “greenhouse effect” means.
B．Why the global temperature rises quickly.
C．How the heat is released back into space.
D．Why the “man-made” greenhouse effect is important to us.
4．In the “natural” greenhouse effect，how is heat released back into space
A．In short wave form.
B．At longer wave lengths.
C．In the form of methane.
D．In the form of carbon dioxide.
√
√
5．What is the author’s attitude towards “greenhouse effect”？
A．It benefits humans.
B．It does harm to humans.
C．It has both good and bad sides.
D．Human beings should eliminate it.
√
(1)_____________
(2)_____________
The
rise
in temperature
led to
examples
results
extreme (3)_________ and (4)_________
not only (5)___________________ but also (6)_________________
Ⅲ.Read Para.4 carefully and do the following exercises.
1．Analyse the structure of this paragraph and fill in the chart.
extreme weather
natural disasters
rainstorms
heatwaves
causing serious damage
costing human lives
2．Why did the author mention the climate scientists’ warning
The author mentioned the climate scientists’ warning because ________________________________________________________________________________________________________.
it is essential that we take action and so it needs to be brought to everyone’s attention
Ⅳ.Read Para.5 carefully and do the following exercise.
Which of the following is not mentioned to deal with global warming
A．People do not use plastic bags in their daily life.
B．Governments make policies and take measures to reduce greenhouse gas emissions.
C．People change inappropriate lifestyles.
D．People educate others about global warming，along with its causes and impacts.
√
Ⅴ.Read the passage again and do the following exercises.
1．What is the genre of this passage
A．Prose(散文)． B．Narration.
C．Argumentation. D．Exposition.
2．In which part of a newspaper or magazine may we find this passage
A．Entertainment. B．Economy.
C．Education. D．Environment.
√
√
3．What’s the author’s purpose of writing this text
A．To show us the bad effects of global warming.
B．To explain the meaning of “carbon footprint”．
C．To tell us to prevent disasters from happening.
D．To call on us to do our bit to protect our planet.
√
Post-reading
Activity 1　Discussion
1．Do you think climate change is the result of human activity？Give your reasons.(Critical thinking)
Yes，humans burn fossil fuels like coal，natural gas and oil to produce energy，along with some by-products called greenhouse gases like carbon dioxide，methane and water vapour，which trap heat from the sun and therefore warm the Earth.So，the growth of the greenhouse gas，carbon dioxide in the air actually comes as a result of things we do every day and the way we produce and use energy.
2．As a student，what should you do to deal with climate change (Creative thinking)
I will try going to school by bike or on foot，reducing the “carbon emission”．
Activity 2　Summary
There is little doubt that Earth is getting warmer and warmer.In 2013，many people 1.____________(shock) by a news photo of a dead polar bear which died of 2.__________(starve)．Experts claimed that low sea-ice levels 3.______(cause) by climate change meant the bear could not hunt seals as before，so it had to travel greater distances to find food.Then what is causing the increase in the global average surface temperature？Climate scientists often mention a key climate process called the “greenhouse effect”，4._____ has two common meanings：the “natural” greenhouse effect and the “man-made” greenhouse effect.
were shocked
starvation
caused
which
The “man-made” greenhouse effect has now become 5.___ big problem.There is strong and comprehensive evidence 6.____ the rise in temperature has led to an increase in extreme weather and natural disasters worldwide.In fact，news reports are 7.__________(frequent) broadcast about extreme rainstorms and heatwaves causing deaths and economic losses.Continued greenhouse gas emissions will result in further warming and long-lasting changes to the 8.______(globe) climate.This requires the attention of people all over the world.We as individuals can reduce our “carbon footprint” by 9.___________(restrict) the amount of carbon dioxide our lifestyles produce.It is our responsibility 10.________(seize) every opportunity to educate everyone about global warming，along with its causes and impacts.
a
that
frequently
global
restricting
to seize
Sentences analysis
1．An expert who has studied polar bears for many years said that from the position of its dead body，the bear appeared to have starved and died.
[句式分析]　该句为____句。who引导__________从句，在从句中作____，指人；that引导____从句。
[自主翻译]　
复合
限制性定语
主语
宾语
一位研究北极熊多年的专家说，从尸体的位置看，这只北极熊像是饿死的。
2．Climate scientists often mention a key climate process called the “greenhouse effect”，which has two common meanings: the “natural” greenhouse effect and the “man-made” greenhouse effect.
[句式分析]　该句为____句。called the “greenhouse effect”为过去分词短语作________；which引导____________从句，在从句中作____。
[自主翻译]　
复合
后置定语
非限制性定语
主语
气候科学家常常会提到一个关键的气候过程——“温室效应”；它有两个常见的含义：“天然”温室效应和“人造”温室效应。
3．There is strong and comprehensive evidence that the rise in temperature has led to an increase in extreme weather and natural disasters worldwide，not only causing serious damage，but also costing human lives.
[句式分析]　该句为____句。that引导的是______从句，解释说明evidence的具体内容；not only...but also...意思是“_____________________”，连接两个并列成分，此处连接两个现在分词短语，在句中作____状语。
[自主翻译]　
复合
同位语
不但……而且……
结果
确凿、全面的证据表明，温度上升导致全球极端天气和自然灾害增多，不仅造成严重破坏，而且使人丧命。
4．Climate scientists have warned that if we do not take appropriate actions，this warming trend will probably continue and there will be a higher price to pay.
[句式分析]　此句为____句。that 引导的是____从句，该从句中又包含了由if引导的________从句，take appropriate actions意思是“______________”。
[自主翻译]
复合
宾语
条件状语
采取适当的行动
气候学家已发出警告：如果我们不采取适当的行动，这种变暖的趋势可能会持续下去，而我们将为此付出更大的代价。
5．It is our responsibility to seize every opportunity to educate everyone about global warming，along with its causes and impacts，because this is the most serious issue affecting all of us on this planet.
[句式分析]　此句为____句。It为________，真正的主语是__________；because引导________从句，affecting all of us on this planet为现在分词短语作________。
[自主翻译]　
复合
形式主语
动词不定式
原因状语
后置定语
我们有责任抓住每一个机会，教育每个人了解全球变暖，包括其成因和影响，因为这是影响这个星球上我们所有人的最严重的问题。
Homework
Review what we have learnt and preview language points.